diff --git a/src/oss/langchain/middleware/built-in.mdx b/src/oss/langchain/middleware/built-in.mdx
index 68d0db2dce..9a3fb254e6 100644
--- a/src/oss/langchain/middleware/built-in.mdx
+++ b/src/oss/langchain/middleware/built-in.mdx
@@ -263,7 +263,7 @@ agent = create_agent(
     middleware=[
         SummarizationMiddleware(
             model="gpt-4o-mini",
-            trigger=[("tokens", 4000), ("messages", 10)],
+            trigger={"tokens": 4000, "messages": 10},
             keep=("messages", 20),
         ),
     ],